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#include <bits/stdc++.h>

int main()
{
    int n, m, limit;
	int tab[500001], growth[500001];
    
    scanf("%d %d", &n, &m);
    for(int i=0; i<n; i++)
    {
        scanf("%d", &tab[i]);
        growth[i] = tab[i];
    }
    
    while(m--)
    {
        long long profit = 0;
        scanf("%*d %d", &limit);
        
        for(int i=0; i<n; i++) 
        {
            if(tab[i] > limit)
            {
                profit += (tab[i]-limit);
                tab[i] = limit;
            }
            tab[i] += growth[i];
        }

        printf("%lld\n", profit);
    }
    
    return 0;
}